/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *	  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jboss.el;

import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.MethodExpression;
import javax.el.ValueExpression;

import org.jboss.el.lang.ELSupport;
import org.jboss.el.lang.ExpressionBuilder;
import org.jboss.el.util.MessageFactory;




/**
 * @see javax.el.ExpressionFactory
 * 
 * @author Jacob Hookom [jacob@hookom.net]
 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: markt $
 */
@SuppressWarnings("rawtypes")
public class ExpressionFactoryImpl extends ExpressionFactory {

	/**
	 * 
	 */
	public ExpressionFactoryImpl() {
		super();
	}

	public Object coerceToType(Object obj, Class type) {
		return ELSupport.coerceToType(obj, type);
	}

	public MethodExpression createMethodExpression(ELContext context,
			String expression, Class expectedReturnType,
			Class[] expectedParamTypes) {
		if (expectedParamTypes == null) {
			throw new NullPointerException(MessageFactory
					.get("error.method.nullParms"));
		}
		ExpressionBuilder builder = new ExpressionBuilder(expression, context);
		return builder.createMethodExpression(expectedReturnType,
				expectedParamTypes);
	}

	public ValueExpression createValueExpression(ELContext context,
			String expression, Class expectedType) {
		if (expectedType == null) {
			throw new NullPointerException(MessageFactory
					.get("error.value.expectedType"));
		}
		ExpressionBuilder builder = new ExpressionBuilder(expression, context);
		return builder.createValueExpression(expectedType);
	}

	public ValueExpression createValueExpression(Object instance,
			Class expectedType) {
		if (expectedType == null) {
			throw new NullPointerException(MessageFactory
					.get("error.value.expectedType"));
		}
		return new ValueExpressionLiteral(instance, expectedType);
	}
}
